Hello, so I’m not 100% sure if there is anything here that will help in your use case but we recently released a number of SPI’s that allow for many modifications. I’m wondering if you would be able to get a comment like this in vis the “bring your own catalog” example.
Catalog SPI tutorial - https://support.wix.com/en/article/velo-tutorial-ecommerce-catalog-custom-extension-beta
Here’s the other new SPI’s that may be of interest to you:
Shipping Rates SPI tutorial - https://support.wix.com/en/article/velo-tutorial-shipping-rates-custom-extension-beta
Additional Fees SPI tutorial - https://support.wix.com/en/article/velo-tutorial-ecommerce-additional-fees-custom-extension-beta
As far as feature requests, if it is related to Velo - meaning it would be an update to an API then you may submit the request with as much detail as possible about the use case here: https://www.wix.com/velo/wishlist
All other requests, such as to the editor or requests for anything native should go through customer support so they make it to the correct team : https://support.wix.com/en/article/contacting-wix-customer-care-for-support